4-Hydroxy-2-methoxy-3-nitro-5-(trifluoromethoxy)pyridine
3-(Fluoromethyl)-2-hydroxy-5-nitro-4-(trifluoromethoxy)pyridine
3-(Chloromethyl)-4-(difluoromethyl)-6-fluoro-2-(trifluoromethoxy)pyridine
3-(Chloromethyl)-4-(difluoromethyl)-2-fluoro-6-(trifluoromethoxy)pyridine